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  <title>比较两个任意精度的数字</title>
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  <div id="layout-content"><div id="function.bccomp" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">bccomp</h1>
  <p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">bccomp</span> &mdash; <span class="dc-title">比较两个任意精度的数字</span></p>

 </div>
 
 <div class="refsect1 description" id="refsect1-function.bccomp-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>bccomp</strong></span>
    ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$left_operand</code></span>
   , <span class="methodparam"><span class="type">string</span> <code class="parameter">$right_operand</code></span>
   [, <span class="methodparam"><span class="type">int</span> <code class="parameter">$scale</code><span class="initializer"> = int</span></span>
  ] ) : <span class="type">int</span></div>

  <p class="para rdfs-comment">
   把<code class="parameter">right_operand</code>和<code class="parameter">left_operand</code>作比较,
   并且返回一个整数的结果.
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.bccomp-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<code class="parameter">left_operand</code></dt>

     <dd>

      <p class="para">
       左边的运算数, 是一个字符串.
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">right_operand</code></dt>

     <dd>

      <p class="para">
       右边的运算数, 是一个字符串.
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">scale</code></dt>

     <dd>

      <p class="para">
       可选的<code class="parameter">scale</code>参数被用作设置指示数字，
       在使用来作比较的小数点部分. 
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.bccomp-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   如果两个数相等返回0,
   左边的数<code class="parameter">left_operand</code>比较右边的数<code class="parameter">right_operand</code>大返回1,
   否则返回-1.
  </p>
 </div>

 
 <div class="refsect1 examples" id="refsect1-function.bccomp-examples">
  <h3 class="title">范例</h3>
  <div class="example" id="example-4052">
   <p><strong>Example #1 <span class="function"><strong>bccomp()</strong></span> example</strong></p>
   <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /><br /></span><span style="color: #007700">echo&nbsp;</span><span style="color: #0000BB">bccomp</span><span style="color: #007700">(</span><span style="color: #DD0000">'1'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'2'</span><span style="color: #007700">)&nbsp;.&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;&nbsp;&nbsp;&nbsp;</span><span style="color: #FF8000">//&nbsp;-1<br /></span><span style="color: #007700">echo&nbsp;</span><span style="color: #0000BB">bccomp</span><span style="color: #007700">(</span><span style="color: #DD0000">'1.00001'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'1'</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">3</span><span style="color: #007700">);&nbsp;</span><span style="color: #FF8000">//&nbsp;0<br /></span><span style="color: #007700">echo&nbsp;</span><span style="color: #0000BB">bccomp</span><span style="color: #007700">(</span><span style="color: #DD0000">'1.00001'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'1'</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">5</span><span style="color: #007700">);&nbsp;</span><span style="color: #FF8000">//&nbsp;1<br /><br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
   </div>

  </div>
 </div>

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